Prerequisites
- All permanents on the battlefield
- Walking Ballista has at least three +1/+1 counters on it
Steps
- Activate Walking Ballista's ability by removing a +1/+1 counter from it, dealing 1 damage to itself
- Walking Ballista triggers, putting two +1/+1 counters on itself
- Repeat an arbitrarily large number of times
- Pass the turn
- The next time you have priority, activate Walking Ballista by removing a +1/+1 counter from it, dealing 1 damage to an opponent
- Repeat step 5 until each opponent loses the game due to having zero or less life
Results
Required Cards 3
Mephidross Vampire
Creature — Vampire
Walking Ballista
Artifact Creature — Construct